SouthAussie
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If MH370 turned south at around 18:25, it would have skirted the northwestern corner of Sumatra... which raises the question of why the flight was not detected by Indonesian radar. Pondering this question, Jeff Wise notes that Indonesia's radar capability is quite advanced and has responded numerous times to incursions by civilian aircraft. But Indonesia emphatically denies that MH370 was detected within its airspace. Yet another mystery....
I'm not so sure about the Indonesian capabilities. As Jeff Wise says, the radar in the western area of Indonesia is in Lhokseumawe, Aceh. It has a range of just 240nm .. a good chunk of those nm (about 100nm?) would be over Indonesian land if it was looking west/south west, leaving only about 140nm covering ocean space.
According to the article below, it monitors traffic in the Malacca Straits (opposite direction to MH370's apparent wayward flight path).
There has been some speculation as to whether they would have even been in a position to see MH370 heading south 'behind' it.
This article also explains how even the powerful Australian Jindalee radar would have only seen a very small unidentified dot on a map, if it did see MH370 at all.
http://anilnetto.com/governance/accountability/aceh-radar-detect-mh370-jakarta-post/
Indonesian radar is about to undergo some big upgrades due to its current capabilities. The unidentified plane - there probably are more than one, but I only know about one Aussie one - recently picked up on radar was directly over their more eastern airspace, which is apparently far more heavily monitored.
http://www.janes.com/article/43682/indonesia-china-discuss-radar-deal
http://www.defencereviewasia.com/ar...nnounces-Indonesian-Radar-Industry-Initiative